On December 5, 2017, MSD SBI, L.P. ("MSD SBI") distributed its ownership of the Issuer's common stock to Michael S. Dell and other representatives of MSD Capital, L.P. ("MSD Capital"). There was no sale of the Issuer's common stock in the open market by MSD SBI on that date.

(2)

This statement is jointly filed by and on behalf of each of MSD Capital, MSD SBI and Michael S. Dell. MSD Capital is the general partner of MSD SBI and may be deemed to beneficially own securities owned by MSD SBI. MSD Capital Management LLC ("MSD Capital Management") is the general partner of MSD Capital and may be deemed to beneficially own securities owned by MSD Capital. Each of Glenn R. Fuhrman, John C. Phelan, and Marc R. Lisker is a manager of MSD Capital Management and may be deemed to beneficially own securities owned by MSD Capital Management. Michael S. Dell is the controlling member of MSD Capital Management and may be deemed to beneficially own securities owned by MSD Capital Management. [footnote cont'd]

(3)

[continuation] Each of Messrs. Dell, Fuhrman, Phelan, and Lisker disclaims beneficial ownership of such securities except to the extent of any pecuniary interest therein. Joel Alsfine, who is a partner in MSD Capital, was appointed to the Issuer's board of directors and each reporting person may be deemed to beneficially own securities owned by Mr. Alsfine.

(4)

Each reporting person states that neither the filing of this statement nor anything herein shall be deemed an admission that such person is, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Act"), or otherwise, the beneficial owner of any securities covered by this statement. Each reporting person disclaims beneficial ownership of the securities covered by this statement, except to the extent of the pecuniary interest of such person in such securities.

(5)

Each reporting person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for purposes of Section 13(d) or 13(g) of the Act. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section 13(d) or 13(g) of the Act or any other purpose, a member of a group with respect to the issuer or securities of the issuer.